2. Chemical & Physical Properties of Matter Post test

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Question 1 of 15

1. Question

Is wood burning a chemical or physical change? Explain why.

Chemical change. When wood burns it changes to ashes, carbon dioxide, water vapor, and other gases that cannot be changed back into wood.
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Chemical change. When wood burns it changes to ashes, carbon dioxide, water vapor, and other gases that can be changed back into wood.
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Physical change. When wood burns it changes to aluminum, carbon dioxide, water vapor, and other gases that cannot be changed back into wood.
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Chemical change. When wood burns it changes to ashes, carbon dioxide, water vapor, and other gases that can be changed back into wood through the law of conservation of matter.
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Question 2 of 15

2. Question

Select ALL of the substances that are unreactive. (4 choices)

Helium
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Neon
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Argon
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Krypton
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Baking soda
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Vinegar
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Question 3 of 15

3. Question

Is iron rusting a chemical or physical change? Why is it considered so?

Chemical change. Iron mixes with oxygen and creates iron oxide, which cannot be changed back into iron.
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Physical change. Iron mixes with oxygen and creates iron oxide, which cannot be changed back into iron.
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Chemical change. Iron mixes with oxygen and creates potassium oxide, which can be changed back into iron.
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Physical change. Iron mixes with oxygen and creates iron oxide, which can be changed back into iron.
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Question 4 of 15

4. Question

Tearing a piece of paper is a property of matter, and a piece of paper is a chemical property of matter.

physical, burning
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physical, freezing
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chemical, burning
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chemical, melting
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Question 5 of 15

5. Question

Select ALL of the factors that will cause substances to dissolve faster. (3 choices)

Increasing temperature
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Stirring or shaking
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Increasing surface area
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Decreasing temperature
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Let sit for a while
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Question 6 of 15

6. Question

Why is electrical wire made up of copper on the inside and plastic on the outside?

Copper is a good conductor of electricity, and the plastic protects the heat and electricity from being exposed to the environment preventing fires.
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Copper is a good insulator, and the plastic protects the heat and electricity from being exposed to the environment preventing fires.
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Plastic is a good conductor of electricity, and the copper protects the heat and electricity from being exposed to the environment preventing fires.
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Copper is a good conductor of electricity, and the plastic protects the heat and electricity from being exposed to the environment preventing electronegativity.
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Question 7 of 15

7. Question

Select ALL of the following that are chemical properties of matter. (3 choices)

Reactivity
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Flammability
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Ability to rust
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Boiling point
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Conduct heat
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Conduct electricity
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Question 8 of 15

8. Question
Match the definition with its correct term.
Sort elements
- ability of matter to combine chemically with other substances.
- ability of matter to burn
- when iron combines with oxygen and creates a new substance
Reactivity

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Flammability

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Ability to rust

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Question 9 of 15

9. Question

Select ALL of the following that are physical properties of matter. (4 choices)

Ability to conduct heat
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Ability to conduct electricity
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Boiling point
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Solubility
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Reactivity
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Flammability
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Question 10 of 15

10. Question
Put the definition next to its correct term.
Sort elements
- Temperature at which a substance goes from being a liquid to a gas.
- Ability to take in a lot of heat without overheating and burning
- Ability to allow electricity to pass through without overheating and burning
- Substances ability to dissolve in other substances
Boiling point

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Ability to conduct heat

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Ability to conduct electricity

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Solubility

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Question 11 of 15

11. Question

A class observes two demonstrations: water changing into steam and a piece of wood burning and producing smoke. Student A claims that both demonstrations are examples of a chemical change. Student B disagrees and claims that water changing into steam is a physical change and the wood burning is an example of chemical change. Construct an explanation to describe which student claim is correct.

Both student claims are correct because production of a gas is a sign of a chemical change.
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Student A is correct because both examples show a production of gas that is an indicator that a chemical change has occurred.
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Both Students are incorrect because both examples result in a change in the state of matter and therefore they indicate that a physical change has occurred.
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Student B is correct because burning is a chemical change and water changing into steam is a change in state of matter and therefore must be a physical change.
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Question 12 of 15

12. Question

Construct an argument based on observational evidence that supports the claim made for each one of the following four phenomena.

The claim that water reacts with iron is an example of a physical change is correct because a new substance has formed.
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The claim that copper changes from solid state to liquid state when it melts is a physical change is correct because a change of state has taken place.
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The claim that a chemical change takes place when a firecracker explodes is correct because no new substance is formed after the explosion.
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The claim that a chemical change has taken place when a piece of magnesium is mixed with hydrochloric acid is correct because magnesium is still present at the end of the chemical reaction.
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Question 13 of 15

13. Question

A group of students conducting an experiment and measured the mass and volume of two ice cubes in a Ziploc bag. They allowed the ice cubes to melt, wiped condensation from the outside of the bag, and measured the mass and volume of the water in the Ziploc bag. The students found that the mass was the same before and after melting but the volume of the ice cubes and water was different. Based on the results of the experiment, the students made the claim that water has gone through a physical change. Which argument BEST supports the students’ claim?

A physical change occurred because water changed from a solid to a liquid.
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A physical change occurred because the mass was the same before and after melting.
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A physical change occurred because condensation formed on the outside of the Ziploc bag.
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A physical change occurred because volume of the ice cubes was different from the volume of the liquid water.
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Question 14 of 15

14. Question

A group of students conducting an experiment measured the mass of a cup of 20 mL of water and two Alka-Seltzer tablets at the same time. They added the Alka-Seltzer tablets to the cup of water, waited for the fizzing to stop, and then measured the cup of water again. The students found that the resulting mass was less than the initial measurement. Based on the results of the experiment, the students made the claim that a chemical change has occurred. Which argument BEST supports the students’ claim?

A chemical change occurred because a fizzing sound was heard.
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A chemical change occurred because the mass before the reaction was different than the mass after the reaction.
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A chemical change occurred because a new substance formed and a gas was released when the tablets dissolved in the water.
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A chemical change occurred because the mass before the reaction was different than the mass after the reaction.
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Question 15 of 15

15. Question

Dry ice is solid carbon dioxide. As dry ice is heated, it goes directly from a solid to a gas through a process called sublimation. The teacher shows the students two possible models to represent this process using pictures of jars showing particle motion. One group of students in the classroom claimed, based on Model A, that sublimation is physical change. Another group claimed, that based on Model B, sublimation is a chemical change. Construct an argument to support the claim made by one of the groups.

Sublimation is a chemical change because, as shown in Model A, dry ice particles have gone from being in a solid state to being in a gaseous state.
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Sublimation is a chemical change because, as shown in Model B, dry ice particles have gone from moving freely to being in close contact with each other.
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Sublimation is a physical change because, as shown in Model A, the only change experienced by the dry ice particles is in their separation and how fast they are moving.
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Sublimation is a physical change because, as shown in Model B, the only change experience by the dry ice particles is in their separation and how slow they are moving.
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2. Chemical & Physical Properties of Matter Post test

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